Not until halfway through the festival did Jesus go up to the temple courts and begin to teach. The Jews there were amazed and asked, “How did this man get such learning without having been taught?”
They should not have been surprised. Even at the age of 12 Jesus had shown that his insight into the Scriptures exceeded theirs. How could he know more than them when he had never studied at their universities? Because he wrote the Scriptures and was the author of what they were about.